JPH09223201A - Id code collation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to optionally change a collation area in order to specifying an ID code collation range in a data carrier by a collation range specification code inputted from a reader/writer. SOLUTION: A collation range specification code generated by a collation range specification part 26 in the reader/writer 20 is detected by a collation range detection part 10 in the data carrier 1, one of collation specification signals S4a to S4d corresponding to the detected contents is outputted and only a specified collation part out of plural collation parts 2a to 2d executes collating operation and outputs a coincidence signal in accordance with the collation result. Unspecified collation parts respectively unconditionally output coincidence signals S1a to S1d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data carrier which communicates with a reader / writer by electromagnetic waves, receives an ID code transmitted from the reader / writer, and stores the individual identification ID in advance in an internal memory. The present invention relates to an ID code collation method for collating with a code.

[0002]

2. Description of the Related Art A conventional ID code collation method using a data carrier and a reader / writer will be described with reference to FIG. First, regarding the internal configuration, the reader / writer 20 controls the basic operation of the entire system based on the specifications of each applicable system, and the operation unit 21 that instructs the processing content according to each operation, and the instruction content from this operation unit 21. Generates a series of command blocks consisting of a basic operation instruction code (command code), an ID code and other data, and transmits it as transmission data to the data carrier 1 and receives reply data from the data carrier 1 and the like. , A communication control unit 2 for controlling a command transmission / reception procedure
2. Modulation unit 24 that modulates a carrier signal based on each bit information “0” or “1” of transmission data, demodulation unit 25 that demodulates a reply signal, power supply to data carrier 1 and carrier signal for operating clock And a clock generator 23 for generating a transmission signal and a carrier signal from the modulator 24, and an antenna coil L2 for receiving a reply signal.

The data carrier 1 includes an antenna coil L1 for controlling communication with the antenna coil L2 of the reader / writer 20 by electromagnetic waves, and the antenna coil L1.
1. A rectification / constant voltage unit 6 for rectifying a carrier signal received by the rectifier 1 by a rectifier circuit including a capacitor and a diode, and a direct current operating power source in the constant voltage circuit, the antenna coil 1
Demodulates the transmission signal from the reader / writer 20 received in
A demodulation section 7 for outputting as reception data S3, a modulation section 8 for modulating return data to the reader / writer 20, a memory 4 as a data storage section including an ID code area 5 in which individual identification ID codes are stored, Reader / writer 20
Of the series of command blocks, the reception ID code latch unit 3 that temporarily holds the reception data corresponding to the ID code, the contents of the reception ID code latch unit 3, and the ID code area 5 in the memory 4 Collation unit 2 for reading out the contents of the collation, reception of a command block from the reader / writer 20, writing or reading of data in the memory 4 according to each command, and collation results of the ID code in the collation unit 2. Based reader / writer 20
The control unit 9 controls the basic operation of the entire data carrier 1 such as a reply operation to.

Here, the ID code is a code used for identifying each data carrier. Generally, all the data carriers are different from each other. Therefore, the larger the number of data carriers used, the more the ID code. It will be big. In this conventional example, the processing unit of data in the data carrier 1 is 1 byte (8 bits), the size of the ID code is 4 bytes, and ID0, ID1, ID2, and ID3 of the reception ID code latch unit 3 are set. It shall be stored byte by byte. The memory 4 stores and holds the write data of the received data S3 under the control of the permission signal S2 from the control unit 9. Although not explicitly shown in FIG. 8, the stored content may be read and transmitted to the reader / writer 20 depending on the processing content. A part of the memory 4 is used as an ID code area 5 and an ID code corresponding to each data carrier is written in advance. For the same reason as described above, ID0 and ID1 of the ID code area 6 are stored. , ID2, and ID3 are stored and held one byte at a time.

In the collating unit 2, ID0 to I of the received ID code latch unit 3 in which the received ID code is stored.
Contents of D3 and I of ID code area 5 of the memory 4
The contents of D0 to ID3 are collated by the same number byte by byte, and the result is output. That is, the content of ID0 of the received ID code latch unit 3 and the stored content ID0 of the ID code area 5 are collated by the ID0 collating unit 2a, and if they match, the ID0 coincidence signal S1a is output. It Similarly, regarding the contents of ID1, ID2, and ID3, the ID1 collating unit 2b and the ID2 collating unit 2 are respectively
c, and ID3 matching unit 2d collates, and if they match, ID1 matching signal S1b, ID2 matching signal S1c
Alternatively, the ID3 match signal S1d is output. Match signal S
Only when all of 1a to S1d are output, the collation results of the ID codes are considered to match.

The controller 9 controls the coincidence signals S1a to S1d.
And the output control of the permission signal S2 for writing the received data S3 into the memory 4 based on the detection result. That is, if the ID code collation results match, the permission signal S2 is output and the reception data S3 is written to the memory 4.
If the collation results do not match, the fact is transmitted to the reader / writer 20, and at the same time, the internal processing is terminated without outputting the permission signal S2. In addition, the control unit 9 performs control such as detection of a command code in the reception data S3, management of the number of reception data bytes based on the contents of this command code, output of various timing signals, and detection of communication error during reception. Done.

Now, a series of command blocks generated by the communication control unit 22 based on the instruction contents from the calculation unit 21 of the reader / writer 20 are modulated by the modulation unit 24 as transmission data and emitted from the antenna coil L2. This electromagnetic wave is demodulated into the reception data S3 by the demodulation unit 3 via the antenna coil L1 of the data carrier 1, and the reader / writer 20
The received data S3 corresponding to the ID code is received by the control unit 9 as a series of command blocks from the, and is temporarily held in the received ID code latch unit 3, and then the collation unit 2 stores the ID code area in the memory 4. 5 and the result is output to the control unit 9. When the collation result in the collation unit 2 does not match, information indicating the mismatch is returned as reply data to the reader / writer 20. Here, it is assumed that the reader / writer 20 does not know in advance the content of the ID code stored in the memory 4 of the data carrier 1. This applies to the following cases. That is, when the data carrier 1 does not have the function of unconditionally returning the content of the ID code stored in the memory 4 to the reader / writer 20, or even if it has this function, the reader / writer 2
Since there are two or more data carriers in the communication area with 0, the reply data is mixed and the reader / writer 20
This is the case, for example, when an accurate ID code could not be received. In such a case, the reader / writer 20 first transmits a command block with the ID code as an arbitrary content. The data carrier 1 receives the data, collates it in the collation unit 2, and if it does not coincide, returns the information that it does not coincide as described above. The reader / writer 20 receives this information and transmits it with the content of the ID code different from the previous one. This is repeated until the matching results match, and the process of writing data to the memory 4 for the data carrier 1 is completed.

I stored in the data carrier 1
A code in which the D code represents 16, that is, 00000010
It is assumed that it is H (4 byte hexadecimal notation, the same applies hereinafter). When a code representing 0 as the minimum value of the ID code, that is, 00000000H is transmitted from the reader / writer 20, the collation result in the collation unit 2 of the data carrier 1 does not match, and the mismatch information is returned. Then, in the reader / writer 20, 1 (0
(00000001H) is transmitted, but the mismatch information is returned in the same manner, and therefore, I, 2, 3, and 4 are transmitted in ascending order.
If the contents of the D code are changed, the transmission of the ID code and the reply operation of the mismatch information are repeated 15 times. Since a code representing 16 is sent as the 16th ID code and the matching results match, it can be seen that in this case, 16 matching operations are required. In the same way, the ID code of the data carrier is FFFFFF.
In the case of FFH, it is necessary to perform the collation operation of 4.3 billion times. In the above, as the collation order of the ID code, an example is shown in which the collation result is performed in ascending order from the minimum value (0) that can be taken by the ID code. It goes without saying that the number of times of matching is as many as the number of combinations of the highest ID codes.

Depending on the application system, the entire area of the ID code may not be necessary as a collation target and only a partial area may be sufficient. For example, when applied to an entrance management system for a building or room, it ranks the people who enter the entrance and stores the rank information corresponding to each data carrier to carry, and the rank is set for each reader / writer installed at the entrance. This is the case where admission / prohibition is performed according to the information. In such a case, for example, among the 4 bytes of the ID code, if 3 bytes are applied as an ID code for identifying each data carrier and the remaining 1 byte is used as the rank information, it is necessary for entry restriction. The information is rank information. According to the specifications of the data carrier, 1 byte of the rank information is used as a collation range.
It is necessary to have a D matching function. On this occasion,
From the above description, it is understood that the number of times the matching result is matched is the maximum number of combinations of 1 byte, that is, the matching operation is performed 256 times. It is also conceivable to use the entire area of the ID code as the collation target, specify the 4-byte ID code as described above, and then search the rank of the target person on the reader / writer side based on the ID code to restrict entrance. However, it takes time to get the ID code, which is not a good idea.

[0010]

As described in the section of the prior art, in the application system using the data carrier, it is necessary to collate all the ID codes in the area where the ID code is stored. In addition, there are cases in which it can be established only by collating a part of the ID codes in the ID code storage area, but in the conventional ID code collating method, the collating range cannot be changed according to the purpose of use, A dedicated data carrier with a fixed collation area was required for each application system.

On the other hand, as for the contents of the ID code transmitted by the reader / writer, when the reader / writer does not know the contents of the ID code stored in each data carrier, that is, the ID stored in the data carrier. If there is no function to return the content of the code to the reader / writer unconditionally, or even if it has this function, two or more sheets are placed in the communication area with the reader / writer due to the characteristic that communication is performed with electromagnetic waves. When the reader / writer cannot receive the correct ID code due to the presence of the data carrier, the reader / writer cannot combine the data carriers within the communication area with any combination. Since the ID codes of the above will be transmitted in order, a considerable number of collation operations are required. Yaria ID code of it takes long time until it matches the collation.

An object of the present invention is to solve the above problems and provide an ID collation system which can be flexibly applied to any application system and can collate an ID code quickly. To do.

[0013]

In order to achieve the above-mentioned object, the present invention is a data carrier and a reader / writer which communicate with each other by electromagnetic waves, wherein the data carrier is previously stored in an internal memory for individual identification ID. The code is stored and the I transmitted from the reader / writer is stored.
The ID stored in the internal memory upon receiving the D code
In the ID code collation method that collates with the code,
The reader / writer has an ID code transmitting means and a collation range designating means for transmitting a collation range designating code capable of arbitrarily designating a part or all of the area in which the ID code of the data carrier is stored. In the data carrier, when the collation range designating code and the ID code transmitted from the reader / writer are received, only the ID code in the designated area among the ID codes stored in the internal memory is stored. It is characterized by having a collation control means for collating.

Further, the ID code transmission means of the reader / writer transmits only the ID code of the area designated by the collation range designation code of the ID codes.

Further, when the collation result of the collation control means of the data carrier does not match, writing or reading to the internal memory is prohibited and no reply is sent to the reader / writer.

Further, the reader / writer collates with the collation range designating means each time while the designated range of the ID code storage area of the data carrier starts from the leading 1 bit and sequentially increments the designated range from the beginning by 1 bit. A sequence control means for controlling the transmission as a range designation code and the presence / absence of a reply from the data carrier and the content of the reply data at the time of the reply each time the reader / writer transmits, and executes the next transmission. It is characterized by having a reply monitoring means for instructing and specifying the ID code content to be transmitted.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a functional block diagram showing the present invention. A part of the reader / writer 20 that controls a basic communication operation with the data carrier 1, that is, a series of command blocks including a command code, an ID code, and other data is generated as transmission data according to the instruction content from the calculation unit 21. A communication control unit 22 that controls a command transmission / reception procedure such as transmitting to the data carrier 1 and receiving reply data from the data carrier 1, and a modulation unit 24 that modulates a carrier signal based on the content of the transmission data. , A demodulation unit 25 for demodulating a reply signal, a clock generation unit 23 for supplying power to the data carrier 1 and a carrier signal for an operating clock, a transmission signal and a carrier signal from the modulation unit 24, and a reply signal Antenna coil L2 to receive
Is the same as that described in the conventional example. Also, in the data carrier 1, an antenna coil L1 that controls communication with the antenna coil L2 of the reader / writer 20 by electromagnetic waves, and a rectifier that rectifies a carrier signal received by the antenna coil L1 and uses it as a DC operating power source with a constant voltage circuit. A constant voltage unit 6, a demodulation unit 7 that demodulates a transmission signal from the reader / writer 20 and outputs it as reception data S3, a modulation unit 8 that modulates return data to the reader / writer 20, and an individual ID code for identification. The memory 4 as a data storage unit including the ID code area 5 and the received ID code latch unit 3 for temporarily holding the ID code among the received series of command blocks are also those described in the conventional example. Is the same as The control unit 9 receives a command block and writes or reads data to or from the memory 4 according to each command.
Although it has a function of controlling the basic operation of the entire data carrier 1 as described in the conventional example, as a reply operation to the reader / writer 20 based on the verification result of the ID code, no reply is sent if the verification does not match. Only when they match, the information corresponding to each command is sent back.

Now, as a function for realizing the present invention,
In the reader / writer 20, as a calculation unit 21, a collation range designation unit 26 that generates a collation range designation code for designating the range of the region to be collated out of the entire ID code region, and the contents of the collation range designation unit 26. An ID code generation unit 27 for generating an ID code according to the above, and a collation range detection unit 10 for detecting the collation range designation code in the data carrier 1 and instructing the collation unit 2 based on the content of the collation range designation code. It is newly added. First, the collation range detection unit 10 detects the collation range designation code in the received data S3, and according to the content of the code, the collation designation signal S4a.
~ S4d is configured to be output.
For example, if 4 bits of one byte (8 bits) of data are applied as the collation range designation code, each bit of the 4 bits of the collation range designation code is one of the collation designation signals S4a to S4d. The collation designation signals S4a to S4d are turned on or off depending on whether each bit is "0" or "1". In addition, as the configuration of the collation range detection unit 10, the collation range designation code is set to 1
If the bit is "0", the collation designation signal S4a
~ S4d are all output, and in case of "1", a specific 1
Two signals may be output.

In the collation unit 2, only the bytes of the ID code corresponding to the output signal are collated by the collation designation signals S4a to S4d from the collation range detection unit 10, and the collation result is otherwise irrelevant. It is regarded as a match. The basic operation of the matching unit 2 is as follows.
It is the same as the collating unit 2 of FIG. 8 described in the conventional example except that the output of the collation result is controlled by the collation designating signals S4a to S4d.

For example, the ID is now given by the collation range designation code.
If ID0 to ID2 of the code ID0 to ID3 are designated, the collation range detection unit 10
ID0 collation designation signal S4a, ID1 collation designation signal S4
b, and the ID2 collation designation signal S4c are output. In the collation unit 2, the contents of ID0 to ID3 of the received ID code latch unit 3 in which the received ID code is stored,
The contents of ID0 to ID3 in the ID code area 5 of the memory 4 are collated, and the ID0 collation unit 2a, the ID1 collation unit 2b, and the ID2 collation unit 2c match each other according to the collation result. For example, ID0 match signal S1a,
The ID1 match signal S1b or the ID2 match signal S1c signal is sent from the ID3 matching unit 2d to the ID3 regardless of the matching result.
The coincidence signal S1d is output. That is, if only the designated range of the ID code matches, the collation result of the ID code is considered to match. As the ID code transmitted from the reader / writer 20, the ID
0 to ID3 may be all, but the ID code of the area designated by the collation range designation code, that is, ID0 to ID3
Only ID2 may be used.

The operation of the ID collation method according to the present invention based on the functional block diagram of FIG. 1 described above will be described in an easy-to-understand manner by using some specific application examples. First,
In FIG. 2, a case where the present invention is applied to a book search as one of application systems is taken as an example. This system is used, for example, in a library or the like when a specific book is quickly searched from a large number of books arranged on a bookshelf. Each book is arranged neatly on the bookshelf with one data carrier 1 attached to its spine, and at the same time, the memory 4 of the data carrier stores 4 bytes of different ID code for each data carrier. It has been done.
Together, this ID code is associated with each book on a one-to-one basis and is managed by a personal computer or ledger.
In addition to the ID code, the memory 4 of the data carrier may store history data such as the purchase date and the amount of money of the book and the date and number of times the book is lent out, if necessary. On the other hand, the reader / writer 20 is provided with an ID code input switch as the ID code generation unit 27,
An ID code to be searched is generated according to the input state of this switch. Further, in this system, as the collation range designation code generated by the collation range designation unit 26, the range of the region to be collated with the ID code is designated as the entire ID code region. FIG. 2A shows a state at the time of searching for a book, and the ID code of the book is an antenna coil L built in the reader / writer 20.
It is assumed that the data carrier attached to each book is sequentially scanned while continuously transmitting from No. 2. The confirmation lamp is such that the presence or absence of a reply from the data carrier 1 based on the collation result of the ID code can be confirmed by an LED or the like, and is turned on when the reader / writer 20 reaches a target book. There is. FIG.
FIG. 2B shows a state in which the reader / writer 20 in FIG. 2A is moved in the order of positions X1, X2, and X3 while sequentially scanning each data carrier, and the communication area of the antenna coil L2 and 1a, The positional relationship with each of the data carriers 1b and 1c is shown.

When the search is to be started, first, the ID code given to the book to be searched is searched for from a management material such as a personal computer or a ledger, and then the ID code input switch 20a of the reader / writer 20 is operated. Then, the ID code is set. In the reader / writer 20, depending on the setting state of the ID code input switch 20a, the ID
The code generator 27 generates an ID code to be collated. As described above, the collation range designation unit 26 generates the collation range designation code so that the entire ID code region is designated as the range of the region to be collated with the ID code. In addition to this, the arithmetic unit 21 gives instructions for processing contents to the data carrier 1 and specifies transmission data depending on the processing contents. However, in order to make it easy to understand, in the present system, the ID code is simply collated and they match. For example, use a command that simply sends a reply to that effect.
The communication control unit 22 receives the above instructions from the calculation unit 21, generates a command block including a command code, an ID code, and a collation range designation code, and transmits the command block. The calculation unit 2
Inform 1 If there is no reply data, that is, if the data carrier 1 does not exist in the communication area with the reader / writer 20, or if the collation result in the data carrier 1 does not match even within the communication area and no reply is sent, The arithmetic unit 21 of the reader / writer 20 again gives the same instruction to the communication control unit 22 to transmit the same command block as the previous time, and thereafter repeats this.
When the data carrier 1 enters the communication area and receives reply data, the arithmetic unit 21 detects this and lights a confirmation lamp to notify that the data carrier has been searched.

Among the data carriers 1, those within the communication area receive the command block from the reader / writer 20 and the collation range detection section 10 detects the collation range designation code, and the received ID code. Is held in the received ID code latch section 3, and the collating section 2 collates this content with the content of its own ID code previously stored in the memory 4. Here, since the entire 4-byte ID code area is set as the collation range designation code, the collation range detection unit 10
Since all the collation designation signals S4a to S4d are output from the I.
The contents of each byte of ID0, ID1, ID2, and ID3 of the D code and the contents of each corresponding byte of the ID code area 5 of the memory 4 are collated by the collating units 2a to 2d of each byte of the ID code. At the same time, matching signals S1a to S1d are output according to the respective matching results. The control unit 9 monitors these coincidence signals S1a to S1d, and when all of them are output, that is, when all the collation results of ID0 to ID3 are coincident, the reader / writer 2
A reply to that effect is sent to 0, but if one or all are not output, no reply operation is carried out.
Since the command code is specified as the command block from the reader / writer 20 so as to perform only the collating operation, the control unit 9 performs the reply or non-reply processing according to the collation result, While shifting to the command block reception standby state, the above operation is repeated until the power supply from the data carrier 20 is cut off from the communication area.

Now, in the state where a certain person has finished operating the ID code input switch of the reader / writer 20 and is continuously transmitting command blocks including the ID code to be searched,
Assuming that the reader / writer 20 is brought close to the data carrier 1a attached to the book at the end of the bookshelf, the reader / writer 20 is at the position X1 in FIG. 2B, and at this time, the data carrier 1a is in the communication area. Only exists. If the ID code stored in the data carrier 1a is different from the ID code to be searched, there is no reply from this data carrier 1a, and the confirmation lamp does not light up, so the reader / writer 20 is moved in the direction of the arrow. Move to. At the position of X2, the data carrier 1b attached to the adjacent book enters the communication area while the data carrier 1a is still in the communication area. Assuming that the data carrier 1b also stores an ID code different from the ID code to be searched, no reply is made and the reader / writer 20 receives nothing. When it further moves to the position of X3, the data carrier 1c enters the communication area this time. If the book to which the data carrier 1c is attached is to be searched, the collation result of the ID code stored in the data carrier 1c and the transmitted ID code match, and a reply is sent from the data carrier 1c. Will be done. At this time, the data carrier 1a is already out of the communication area, while the data carrier 1b is in the same area, but the ID code is different, so no reply is made. As a result, the reader / writer 20 sends the data carrier 1a The confirmation lamp lights because only reply data is received. The search is completed as described above. Note that in FIG. 2B, the number of data carriers that are simultaneously present in the communication area is two, but for convenience of explanation, there is one data carrier in which the ID code to be searched is stored, and a plurality of data carriers are simultaneously used. Since there is no interference due to the data carrier performing a reply operation, there is no problem even if there are more than two.

As a next application example, an application to another system will be described. First, in FIG. 3, this system is used for gate entrance / exit management to a specific site, building or room. A reader / writer 20 is incorporated in the gate A, and in addition to communicating with the data carrier 1, it has the functions of opening and closing the door, displaying information to the entering and exiting people as necessary, and making voice announcements. Good. The data carrier 1 is carried by an attendant who is worn on the arm or the like and carries the antenna coil L when passing through the gate A.
Communication is performed by holding up to 2, and entry / exit determination is made based on the ID code comparison result, and the gates that can pass through are limited by the content of the ID code. To put it the other way around, each gate has a predetermined ID code entered in advance, so that the door can be opened and passed only when carrying a data carrier storing the corresponding ID code. ing. In order to make the explanation easy to understand, this system imposes the above passage restrictions at the time of entry and unconditionally passes at the time of exit. In addition, it is assumed that the target of the entrance management is the department to which the visitor belongs, and a code for identifying the department that can enter is pre-entered at each gate. As a result, as the ID code of the data carrier 1, 3 bytes out of 4 bytes are used for personal identification,
The remaining 1 byte is used as a code for identifying the department to which the user belongs. FIG. 3A shows a state in which two people carrying a data carrier are about to pass through a gate. Further, FIG. 3B shows the content of the ID code of the data carrier 1 used in this system. Of the 4 bytes of ID0 to ID3 in the ID code area 5 of the memory 4, 3 of ID1, ID2 and ID3 are shown. It shows that predetermined contents are stored by using a byte for personal identification and a byte of ID0 for belonging department identification.

In FIG. 3 (a), a belonging department identification code permitting entry is pre-entered in the gate A, and the ID code generating section 27 of the built-in reader / writer 20 stores the belonging department identification code. The ID code to be collated is generated according to the input state of. As described above, in this system, since the target of the entrance management is the department to which the visitor belongs, only the area of the ID code of 1 byte in the area of the ID code of 4 bytes needs to be matched. Then, the collation range designation code is generated so that ID0 is designated as the range of the area to be collated with the ID code. The other parts of the reader / writer 20 are almost the same as the operation of the example applied to the above-mentioned book search. That is, the operation unit 21 instructs the data carrier 1 to execute a command that only collates the ID code, and the communication control unit 22 receives the command, and the command block including the command code, the ID code, and the collation range designation code is received. Is generated and transmitted, the presence / absence of reply data is monitored and the contents thereof are notified to the arithmetic unit 21. If there is no reply data, that is, if the data carrier 1 does not exist in the communication area with the reader / writer 20, or if the collation result in the data carrier 1 does not match even within the communication area and no reply is sent, The arithmetic unit 21 of the reader / writer 20 again gives the same instruction to the communication control unit 22 to transmit the same command block as the previous time, and thereafter repeats this. When the data carrier 1 enters the communication area and receives reply data, the arithmetic unit 21 detects this and opens the door to permit entry.

On the other hand, in the data carrier 1, the command block is received from the reader / writer 20, the received ID code is held in the ID code latch unit 3, and the control unit 9 based on the collation result in the collation unit 2. The reply operation of is also the same as the operation of the example applied to the search of the book. The collation range detection unit 10 detects the collation range designation code. However, since the one byte of ID0 of the 4-byte ID code is the collation target, only the collation designation signal S4a is output from the collation range detection unit 10. Is output, the contents of ID0 of the ID code held in the reception ID code latch unit 3 and the ID of the memory 4 are output.
The collating unit 2a collates the content of ID0 of the code area 5 and outputs a coincidence signal S1a according to the collation result. At this time, since ID1, ID2, and ID3 are not targeted for verification, the match signals S1b, S1c, and S1d from the matching units 2a, 2b, and 2c are always in the output state and match. It is regarded. As the number of bytes of the ID code transmitted from the reader / writer 20, the number of bytes designated by the collation range designation code, that is, only 1 byte of the target ID0 in this system, or more than the designated number of bytes That is, 3 bytes of ID1 to ID3 in this system are added as dummy codes and all 4 bytes of ID code are transmitted, as long as the communication protocol between the reader / writer 20 and the data carrier 1 is determined. Either way is acceptable.

Now, a person carrying the data carrier 1f in the communication area of the gate, which continuously transmits the command block including the ID code, which is the belonging department identification code, which should be permitted to enter from the antenna coil L2. And two people carrying the data carrier 1g come in at the same time. If it is assumed that the data carrier 1f stores a department identification code that permits entry at this gate, and the data carrier 1g stores another department identification code that does not correspond to this gate, the data carrier 1f.
From the data carrier 1g, no reply is sent because the matching results do not match. As a result, the reader / writer 20 receives this reply signal to permit entry and open the door.

As can be seen from the two application examples described above, in the ID collation system according to the present invention based on the functional block diagram of FIG. 1, the collation area of the ID code of the data carrier 1 is the reader / writer 20. Can be arbitrarily specified based on the contents of the collation range designation code generated by the collation range designation unit 26 and transmitted as a command block, and can be applied to different application systems of the above two usage modes. It will be possible.

Next, another embodiment of the present invention will be described. Of the two application examples used in the description of the above-described embodiment, in the gate entrance / exit management shown in FIG.
The two persons who have entered the communication area of the gate belong to the same department, the department identification codes stored in the data carriers 1f and 1g are the same, and they are subject to admission at this gate. Suppose it was a thing. In this case, both the data carriers 1f and 1g simultaneously reply to the command block transmitted from the reader / writer 20, resulting in interference and the reader / writer 2
If 0, normal reception cannot be performed. As a solution to this, a collation method using personal identification codes that are different for each person even in the same department, that is, in the command block transmitted from the reader / writer 20,
The contents of the ID code and the collation range designation object by the collation range designation code are the personal identification codes, and only one of the plurality of data carriers responds to the predetermined ID code so that each individual can respond. A method of specifying the data carrier is conceivable, but in the procedure described in the conventional example, since the ID codes of all combinations are transmitted in order, a considerable number of collation operations are required. The ID code collating operation is performed in the procedure as shown.

FIG. 4 is a functional block diagram showing another embodiment of the present invention. In the embodiment described above, as shown in FIG.
˜ID3 of 4-byte ID code, the data carrier 1 has ID0 collation designation signal S4a to ID3 collation designation signal S based on the collation range designation code from the reader / writer 20.
According to the output state of 4d, each unit of the ID0 collating unit 2a to the ID3 collating unit 2d is designated in the unit of at least 1 byte, but in the present embodiment, this can be designated in more detail in the unit of 1 bit. That is, in the data carrier 1 of FIG. 4, the ID3 collating unit 2d is composed of eight b7 collating units 2e to b0 collating unit 2l, each corresponding to each bit of b7 to b0 of ID3, and the b7 collating designation signal S.
4e to b0 collation is performed according to the output state of the collation designation signal S4l, and the b7 coincidence signal S1 is obtained according to each collation result.
It is configured to output the e-b0 coincidence signal S1l. Although not shown in FIG. 4, another matching unit 2a,
Similar to the ID3 collating unit 2d, 2b and 2c are also configured to collate bit by bit. On the other hand, in the reader / writer 20, as the calculation unit 21, an ID code determination unit 28 that determines whether or not the transmitted ID code has valid contents based on the presence or absence of a reply from the data carrier 1, and this I
A sequence control unit 29 for controlling the transmission sequence of the ID code and the collation range designation code based on the determination result from the D code determination unit 28 is newly added. The ID
The code determination unit 28 monitors whether or not there is a reply from the data carrier 1 to the transmitted ID code, and if there is no reply, determines that the data carrier 1 having the ID code transmitted at that time does not exist in the communication area. Then, the ID code is determined to be invalid, and if there is a reply, it is determined that the data carrier 1 having the ID code transmitted at that time exists, and the ID code is determined to be valid, and the determination result is used as the ID code generation unit. Let 27 know.
The ID code generator 27 deletes the ID code determined to be invalid, and when valid, generates an ID code to be transmitted next time based on the ID code and stores and stores the ID code.
The order control unit 29 specifies the ID code to be transmitted next to the ID code generation unit 27, and expands the ID code collation area each time the determination result from the ID code determination unit 28 is received. Each time, the collation range designating unit 26 is instructed. That is, as the collation range of the ID code, first, the first 1 bit of the ID code is designated, then the first 2 bits of the ID code, and thereafter, the collation range is sequentially increased by increasing by 1 bit. . In the collation range designation unit 26, a collation range designation code is generated according to the instruction content from the order control unit 29, and the collation range designation code is transmitted as a command block together with the corresponding ID code generated by the ID code generation unit 27. Be done. The collation range designating code generated by the collation range designating unit 26 is encoded so as to designate a specific bit and the number of bits of the ID code, and the collation area of the ID code is consecutive from a certain 1 bit. It is assumed that the specified number of bits can be specified within the range. In addition, as the command code in the command block from the communication control unit 22,
It is assumed that an ID code read command for reading and returning the contents of the ID code area 5 stored in the memory 4 of the data carrier 1 is designated.

First, in the reader / writer 20,
The order control unit 29 instructs the collation range designation unit 26 and the ID code generation unit 27 so that the first 1 bit, that is, the bit 7 (b7) of ID3 is set as the collation area of the ID code. In the ID code generator 27, the ID code to be collated is I
The D code is generated and is transmitted from the communication control unit 22 as a command block in which the command code is the ID code read command together with the collation range designation code generated by the collation range designation unit 26. The data carrier 1 receives this command block, and the collation range detection unit 10 detects the collation range designation code and detects the ID.
By outputting only the b7 collation designation signal S4e of 3 and the ID code latch unit 3 temporarily holds the received ID code, the held content of b7 of ID3 becomes "1". B3 of ID3 of code area 5
The stored content of is collated in the ID3 b7 collation unit 2e, and the result is output as the ID3 b7 coincidence signal S1e. Other areas of the ID code, that is, b6 to b of ID3
B and b of 0 and ID2, ID1, and ID0
No matching is performed on each bit of 0, and it is assumed that the matching results always match, and the match signal from the matching unit of each bit is output. Here, the ID of the memory 4
Assuming that the stored content of b7 of ID3 in the code area 5 is "1", the b7 matching signal S1e from the b7 matching unit 2e of ID3 is output, and the control unit 9 judges that the matching results match for all bits. The contents of the ID code area 5 which are regarded as being stored in the memory 4 are read out as described above, and the contents are returned to the reader / writer 20.
In addition, b of ID3 of the ID code area 5 of the memory 4
When the stored content of 7 is "0", the content of the memory 4 is not read and no reply is made. Now, temporarily, a plurality of data carriers 1 are set in the communication area with the reader / writer 20.
Is present, that is, the ID code collation target, that is, b7 of ID3 of the ID code area 5 of the memory 4
When there are two or more data carriers 1 whose stored contents are "1", the reply from each data carrier is made at the same time and interference occurs, so that a communication error occurs in the reader / writer 20, resulting in an individual data carrier. I can't receive the exact reply. The reader / writer 20 detects the presence or absence of a reply from the data carrier 1 and the presence or absence of a communication error due to interference even when there is a reply, and informs the arithmetic unit 21 via the communication control unit 22. The ID code determination unit 28 of the arithmetic unit 21 determines whether or not the transmitted ID code is valid according to the information from the communication control unit 22. First, if there is a reply but the content is a communication error, it is determined to be valid because there are at least two or more data carriers 1 for which the content of the ID code to be verified is "1". Then, the ID code generation unit 27 generates and stores the ID code to be transmitted next time based on the content of the ID code. If there is no reply, it is determined that there is no data carrier 1 in which the content of the ID code to be collated is "1", and the ID code generator 27 deletes the ID code from the stored content. . If there is a reply and the content can be normally received, it means that the ID code of one of the plurality of data carriers can be specified. At this time, although the ID code determination unit 28 determines that the ID carrier is valid, there is no other data carrier 1 in which the content of the ID code to be collated is “1”. Therefore, the ID code generation unit 27. Is instructed to delete the ID code from the stored contents. After the above operation according to the content of the reply, in the reader / writer 20, the collation area of the ID code is set to b7 of ID3 as in the previous time, and the content of the ID code to be collated is now "
Then, the data carrier 1 performs the same collation and reply operation as the previous time with the content of the ID code to be collated as "0" in the data carrier 1. According to the reply content, the reader / writer 20 responds in the same manner as described above. Yes, but if the content is a communication error, it is determined to be valid and the ID
An ID code to be transmitted next time is generated based on the content of the code and stored and retained. Further, when there is no reply or when the reply contents are normally received, the ID code is deleted from the stored contents. In this way, the first 1 bit of the ID code is collated with the contents of "1" and "0", and if the reply content from the data carrier 1 is a communication error, the content of the ID code is checked. Based on this, an ID code to be transmitted next time is generated and stored and retained.

Next, the sequence control unit 29 expands the collation range of the ID code by 1 bit, and as the collation area, from the first bit to the second bit of the ID code, that is, bit 7 of ID3.
(B7) and bit 6 (b6) are targeted for matching, and the matching range designation unit 26 and the ID code generation unit 27 are instructed. As the contents of the ID code to be collated in the ID code generation unit 27, the contents stored and retained in the ID code determination unit 28 that were determined to be valid last time remain unchanged, and the contents of b6 newly collated are set to "1". An ID code such as "" is generated. The collation range designation unit 26 generates a collation range designation code for designating b7 of ID3 and 2 which is the number of bits of consecutive length from that bit to b6, and is generated by the ID code generation unit 27. Along with the ID code, the command code is transmitted from the communication control unit 22 as a command block using the command code as the ID code read command. Data carrier 1
In this case, the command block is received, the collation range designation code is detected, and the received ID code is temporarily held.
From b7, a 2-bit collation designation signal, that is, a b7 collation designation signal S4e and a b6 collation designation signal S4f are output, and the held content of b7 and the held content of b6 of ID3 in the ID code latch unit 3 are "1", The stored contents of b7 and b6 of ID3 in the ID code area 5 of the memory 4 are I
The b7 matching unit 2e and the b6 matching unit 2f of D3 perform matching, and the matching result is output as the b7 matching signal S1e and the b6 matching signal S1f of ID3. It is regarded that the contents of the ID code area 5 stored in the memory 4 are read out, and then the contents are returned to the reader / writer 20. As described above, in the reader / writer 20, when the reply content from the data carrier 1 is a communication error, the ID code to be transmitted next time is generated based on the content of the ID code and stored and held. Take action. Further, the ID code collation area is set to b7 and b6 of ID3 as in the previous time, and the content of b6 of the ID code content to be collated is set to "0" this time, and then the data carrier 1 is similarly transmitted. The operation will be performed according to the reply contents. After performing the above collation operation with the collation area of the ID code set to b7 and b6 of ID3, the collation area is further expanded by 1 bit and ID3
B7, b6, and b5, and the contents of b5 of ID3, which is the new collation target, are added to the contents of the ID code stored and held up to the previous communication error.
In each case of 1 ”and“ 0 ”, the same collating operation as described above is performed, and this is repeated until b0 of ID3,
Continuously ID in the order of b7 and b6, b5, b4 of ID2
Go to b0 of 2 and continue to b7 and b of ID1
6, b5 and ID1 to b0 are executed for the area of the ID code assigned as the personal identification code. In this way, starting from the first 1 bit of the ID code,
The collation range is expanded one bit at a time, and the contents of the 1-bit collation target newly designated as the collation area are set to "1" and "0" and stored and held last time.
When a new ID code is added to the content of the code and the reply content from the data carrier 1 is a communication error after performing the matching operation with each content, there are a plurality of data carriers 1 having the ID code. I as the thing
The contents of the D code are stored and retained. After that, the collating range of the ID code is further expanded by 1 bit and the collating operation similar to the above is repeated, but when there is a reply from the data carrier 1 on the way and there is no interference, and when the data is normally received, there is no reply. In this case, the ID code is deleted from the target of the collation operation because its content is fixed, and when the communication error finally disappears, the ID codes of all the data carriers 1 in the communication area are identified and collated. The operation will be completed.

The above ID code collating operation will be explained in an easy-to-understand manner with reference to a flow chart. 5 to 7 show the operation flow of the functional block diagram of FIG.
The procedure for specifying the ID code collation area is mainly shown. In this description, it is assumed that the ID code is a continuous m + 1 bit from b0 to bm and there is no delimiter in byte units. For example, the personal identification code given in 3 bytes of ID3, ID2, and ID1 among the ID codes used in the description of FIG. 4 is 24 bits of continuous b0 to b23 in FIG. In addition, the least significant bits b0 to b of the ID code are designated as the order of specifying the ID code collation range.
It is assumed that the bits are expanded to higher bits in the order of 1, b2, b3. Now, FIG. 5 shows abbreviated symbols and their contents used for simplifying the explanation. At some point during the matching operation, the ID code matching area is set to b.
When 0 is set to n + 1 bits up to bn, the contents of the ID code to be collated are the contents stored and held last time from b0 to bn-1 (indicated by * in the figure).
"1" and "0" are added to the contents of bn. Of these, when the contents of bn are "1", the ID code is IDn (1) and bn is "0". IDn
It is abbreviated as (0). Further, FIG. 6 is a flow chart showing the matching operation at this point. First, step 100
Then, the reader / writer 20 designates the collation area of the ID code from b0 to bn and sets the content of bn to "1".
Send Dn (1). In step 101, the reply from the data carrier 1 is confirmed, and if there is no reply, the process proceeds directly to step 104, the next ID code with the content of bn set to "0" is transmitted, and there is a reply and If the contents are normally received, the process proceeds to step 104 after detecting the ID code of one of the plurality of data carriers 1 in step 108, but in any case, IDn (1) is stored and held. Instead, it will be deleted from the target of the subsequent matching operation. When a communication error occurs as a result of receiving the reply from the data carrier 1, the process proceeds to step 102, and the content of the ID code IDn (1)
Is stored and held, and in step 103 IDn
After turning on the flag Fn (1) indicating that (1) is valid, the process proceeds to step 104. Then step 10
4, the ID code collation area remains from b0 to bn, and this time the content of bn is set to "0".
(0) is transmitted. At step 105, the reply from the data carrier 1 is confirmed, and like step 101,
When there is no reply, the process proceeds to step 110 as it is, and when the reply is normally received, the process proceeds to step 110 after detecting the ID code in step 109, and IDn
The memory holding of (0) is not performed. If the reply content is a communication error, IDn (0) is returned in step 106.
Is stored and held, and the flag Fn (0) indicating that IDn (0) is valid is turned on in step 107, and then the process proceeds to step 110. In step 110, the flag Fn
Depending on the contents of (1) and Fn (0), IDn (1) or IDn stored and held respectively when turned on.
Based on (0), the process proceeds to the next step in order to perform the same collating operation for the next bit bn + 1. If neither of the flags Fn (1) and Fn (0) is on, the above step 10 is performed.
The ID code is detected in 8 or 109, or it is considered that the reply is interrupted because the data carrier 1 is out of the communication area during the collation operation, and the ID is
The collating operation so far regarding the above collation target of the code is stopped here. For reference, FIG. 7 is a flow chart showing a state in which the collation is performed while the collation range of the ID code is sequentially expanded by 1 bit from the start of collation. Here, the flow chart of the collation operation at the time when the collation area of the ID code is n + 1 bits up to bn, which has been described so far, is abbreviated as IDn.

First, in step 200, the collation operation is performed when the value of n is 0, that is, the collation area of the ID code is b0 and the contents are "1" and "0". If there is a communication error and there are two or more data carriers having the ID code in the communication area, the next step 201 or 20
We will proceed to step two or both.
ID in the communication area where the content of b0 is "1"
There is more than one data carrier with a code, b0
If there is only one that is "0", the ID
The collating operation ID1 of the next bit based on 0 (1) is performed in step 201, but the ID code of the data carrier whose content of b0 is "0" is only one, and the reader / writer 20 returns it. Since the content of the ID code is determined by normally receiving the ID code, the collating operation ID1 based on ID0 (0) in step 202 is not executed. On the contrary, if there is only one data carrier having the ID code in which the content of b0 is "1" and there are two or more data carriers in which b0 is "0", step 201 is not executed and step 202 is executed. Then, the collating operation ID1 of the next bit b1 is executed. In addition, the content of b0 is "1" or "0" I
One data carrier each with D code,
Alternatively, if either one is present and the other is absent, the ID codes of all the data carriers are fixed at that point, and the matching operation ends. Based on the result of the ID0 matching operation in step 200, the ID1 matching operation is performed in steps 201 to 202. Then, the ID2 matching operation is performed in any of steps 203 to 206 according to the result.
Further, the collation operation of ID3 is performed in steps 207, 208, etc., and thereafter, the maximum ID is increased while sequentially expanding the bit n.
The matching operation is performed up to m.

In the collation procedure of the ID code consisting of m + 1 bits shown in FIG. 7, the number of times of the collation operation is examined with one transmission of the ID code from the reader / writer 20 and the reply from the data carrier 1 as one time. And I
Since Dn performs the collating operation of "1" and "0" twice as the content of bn, the collating operation is performed twice in step 200 for ID0 and the step 20 is performed for ID1.
Since 1 and 202 are each twice, a total of 4 times, similarly, ID2 is 8 times, ID3 is 16 times, and IDm-1 is 2 to the m-th power, so all the matching of the value of n from 0 to m is performed. If the operation is performed, the total is 2 + 2 * 2 + 2 * 2.
Since * 2 + ... + 2 * (2 to the m-th power), the maximum value Tmax of the number of collation operations is given by Equation 1.

[Equation 1] However, this is a case where all combinations of m + 1-bit ID codes are present as the data carriers existing in the communication area, and the number of data carriers existing simultaneously in the communication area may be limited. Many. Depending on the number P of data carriers in the communication area, the above equation 1 becomes the following equation 2.

[Equation 2] Here, INT (P / 2) is a value of an integer part when P is divided by 2, and MIN is a value in [], whichever is smaller. It can be easily imagined that the above formula 2 is established from the following conditions. That is,
As a condition of the ID code that increases the number of collation operations, the contents of b0 to bm-1 are the same, but the combination of two such that the contents of bm are different, and the collation operation is performed up to the final bit bm of the collation area. To do. The contents of an arbitrary continuous local bit string among b0 to bm-1 are set to be as different as possible for each combination. This is the case where the ID codes are combined such that At this time, the maximum number of times IDn is collated is 2 (n + 1).
However, when the number of data carriers is P, the maximum number of combinations of ID codes that cause a communication error is P / 2 (where P is an even number), and for each combination. Since the number of collation operations is up to (P / 2) * 2 because the collation operation is performed twice with the contents of bn being “0” and “1”, the number of data carriers is P. The maximum value of the number of times IDn is collated is limited to 2 (n + 1) th power or (P / 2) * 2, whichever is smaller. By the way, when P is an odd number, only one is left for every two combinations of ID codes, and the content of the ID code is fixed before performing the IDm collating operation. It will be calculated as INT (P / 2). With respect to what has been described above, some specific examples will be given to perform simulations to confirm the ID code verification procedure and the number of verification operations.

Tables 1, 2 and 3 show P = 2 and P = 4, respectively, as the number P of data carriers in the communication area.
And P = 8, the collation operation is simulated by setting a specific ID code for each data carrier. Each table a shows the contents of the ID code stored in advance for each data carrier, and each table b shows how the ID codes of those data carriers are collated. In order to make the explanation easy to understand, here, the ID code is set to 8 bits from b0 to b7, and the order of specifying the collation range of the ID code is the lowest order of the ID code as in the description using the flowchart of FIG. Bits b0 to b1, b2, b
In the order of 3, the bits are expanded to the higher bits up to b7.

[Table 1] First, in Table 1a, I of two data carriers A and B
The content of the D code is set so as to satisfy the condition of the ID code such that the number of times of the above-mentioned matching operation increases. That is, the contents of b0 to b6 are the same for the data carriers A and B, and the contents of b7 are "1" for the data carrier A and "0" for B. Although the contents of b0 to b6 are set to "1" for each bit here, the data carriers A and B may be set to "0" or even if "1" and "0" are mixed. If they are the same, the number of matching operations is the same. Table 1b shows the ID code collation operation in the case where the data carriers A and B having the above ID code are simultaneously present in the communication area, and a state in which the contents of the respective ID codes are determined is simulated. . In steps 300 and 301, b0 is first designated as the collation area of the ID code, the contents are set to "1" and "0", and the collation operation is performed for each, and the reception result of the reply content from the data carrier is shown. ing. Incidentally, these steps 300 and 301 correspond to step 200 in the flowchart of FIG. 7 used in the above description. As a result of the collation operation in which the content of b0 is "1" in step 300, both data carriers A and B have ID codes whose content is "1", and therefore a reply is made at the same time to cause interference. As a result of reception by the reader / writer, "Communication error" is written in the item of reply content in the table. Next, in step 301, the contents of b0 are
The collation operation is performed as 0 ", but there is no reply from any data carrier, so the reply content is" none ".
Next, in step 302, the ID code collation area is set to 1
The number of bits is increased to b1 and the content of b1 is set to "1" based on the content of the ID code that caused the communication error last time (b
Even if the collating operation is performed with the ID code of 0, b1) = (1, 1), a "communication error" occurs, and further step 303
Then, the content of b1 is set to "0" this time (b0, b
1) = (1,0) is matched with the ID code to obtain a reply “none”. Then step 30
In 4 and 305, the collation area of the ID code is expanded to b2, and the content of the ID code that caused the communication error last time (b0, b1)
= (1,1) as the content of b2
In step 4, "1" is added, and in step 305, "0" is added to perform the matching operation, and then step 30 is performed.
Similar to the above, the collating operation according to the reply contents is repeated while expanding the collating area of the ID code by 6 bits up to 6 and 307 and step 313. ID in step 314
The code collation area is limited to the last bit b7, the content is set to "1", and the collation operation is performed. As a result, since a reply is sent only from the data carrier A, this is normally received and the content of the ID code is fixed. In the next step 315, the ID code of the other data carrier B is fixed and the collating operation is completed.

Looking at the number of collation operations, b0
The collation operation in the case where B is the collation target is twice in steps 300 and 301, and in the case where b1 is the collation target is twice in steps 302 and 303, and the following b is performed.
2 for 2 times, b3 for 2 times, and b4, b5, b6, and b7 for 2 times each, and a total of 2 + 2.
+ 2 + 2 + 2 + 2 + 2 + 2 = 16, and the 8-bit I
It can be seen that when there are two data carriers having the D code in the communication area, each ID code can be determined by a maximum of 16 collating operations.

Next, in Table 2b, the collation operation was simulated for the case where four data carriers A, B, C and D having the ID codes shown in Table 2a exist in the communication area.

[Table 2] The manner of performing the collation for each bit is almost the same as that described above, but as a result of the collating operation in steps 400 and 401 for b0, the content of the bit is "1" and In either case of "0", a "communication error" is generated, and either step 402, 403, or step 40 based on the contents of those ID codes.
Since the collating operations 4 and 405 are performed, it can be seen that the number of collating operations for b1 is 4 times. Therefore, it is 2 + 4 + 4 + 4 + 4 + 4 + 4 + 4 = until all the ID codes of the four data carriers are determined.
It becomes 30 and it can be seen that a maximum of 30 collation operations are required.

[Table 3] The same applies to the case of the six data carriers A to F shown in Table 3, and in this case, from step 500 to step 541, 2 + 4 + 6 + 6 + 6 + 6 + 6 + 6.
= 42, which means that a maximum of 42 collation operations are required. In any case, it is obvious that the above-mentioned mathematical expression 2 can be applied as the maximum value of the number of times of the matching operation.

Similarly, in Table 4, a simulation was performed for the case where eight data carriers A to H exist in the communication area.

[Table 4] The contents of each ID code shown in Table 4a are set so as to satisfy the conditions of the ID code which also increases the number of times of the above-mentioned matching operation, and the data carriers A and B, C and D, E and F are set. And for each combination of G and H,
The contents of ID codes b0 to b6 are the same, and the contents of b7 are "1" for one data carrier and "0" for the other data carrier. Regarding the above conditions, any continuous local bit string from b0 to b6, for example, b0 to b2 or b4
It is understood that the same contents are not obtained between the above combinations even if any of the 3 bits from b to b6 is taken and the above condition is satisfied. As the number of collating operations, the collating operation number is added for each bit to be collated from step 600 to step 653 in Table 4b, and 2 + 4 + 8 + 8 + 8 + 8 + 8 + 8 = 54 is obtained. I find it necessary. As described above, when two data carriers exist in the communication area, the number of matching operations is 16 times at maximum and the same number of times for four data carriers is 30 times.
The number of times is 6, 42 times in the case of 6 times, and 54 times in the case of 8 times. , The collating operation is performed while changing the contents of the ID code in ascending order, and the 8-bit ID code requires a maximum of 256 collating operations regardless of the number of data carriers.

[0041]

As is apparent from the above description, according to claim 1 of the present invention, a part or all of the ID code collating area can be arbitrarily designated by the reader / writer. In addition, the present invention can be applied to any application system by only changing the collation area according to the purpose of use. Further, according to claim 4 of the present invention, an ID code when a plurality of data carriers exist in the communication area. As a collation procedure, the collation area is sequentially expanded by one bit and collation is performed, so that the number of collation operations is reduced as compared with the conventional method, and the time required to determine the ID code is significantly shortened. It is very effective in providing a high performance data carrier that can be used.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a diagram illustrating an actual usage state based on the application system described in the embodiment of the present invention.

FIG. 3 is a diagram illustrating an actual usage state based on another application system described in the embodiment of the present invention.

FIG. 4 is a functional block diagram showing the configuration of another embodiment of the present invention.

5 is a diagram showing an operation flow of the configuration shown in FIG. 4. FIG.

FIG. 6 is a flowchart showing a flow of operations of the configuration shown in FIG.

FIG. 7 is a flowchart showing a flow of operations of the configuration shown in FIG.

FIG. 8 is a functional block diagram showing a configuration of a conventional technique.

[Explanation of symbols]

 1 Data Carrier 2 Collating Unit 3 Received ID Code Latch Unit 10 Collating Range Detecting Unit 20 Reader / Writer 26 Collating Range Designating Unit 27 ID Code Generating Unit 28 ID Code Determining Unit 29 Sequence Control Unit

Claims (4)

[Claims] 1. A data carrier and a reader / writer that communicate with each other by electromagnetic waves, wherein the data carrier stores an individual identification ID code in an internal memory in advance, and the ID transmitted from the reader / writer.
In the ID code collation method for receiving a code and collating with the ID code stored in the internal memory, the reader / writer has an ID code transmitting means and an area in which the ID code of the data carrier is stored. And a collation range designating means for transmitting a collation range designating code capable of arbitrarily designating a part or all of the region, and in the case of a data carrier, the collation range designating code and the ID code transmitted from the reader / writer. An ID code collation system characterized by having a collation control means for collating only an ID code of a designated area among the ID codes stored in the internal memory when receiving. 2. The ID code collation system according to claim 1, wherein the ID code transmitting means of the reader / writer is an ID.
Of the codes, only the ID code of the area designated by the collation range designation code is transmitted.
D code matching method. 3. The ID code collation method according to claim 1, wherein when the collation result of the collation control means of the data carrier does not match, the writing or reading to the internal memory is prohibited and the data is read to the reader / writer. ID code collation method that does not reply. 4. The ID code collating method according to claim 1, claim 2 or claim 3, wherein the reader / writer has the designated range of the ID code storage area of the data carrier at the top of the collating range designating means. Starting from the bits, the sequence control means is controlled so as to transmit each time as a collation range designation code while increasing the designated range from the beginning one bit at a time, and a reply from the data carrier each time the reader / writer transmits. An ID code collating method characterized by having a reply monitoring means for monitoring the presence or absence of a message and the content of the reply data at the time of reply, and designating the execution of the next transmission and designating the ID code content to be transmitted.